| http://www.w3.org/ns/prov#value | - The first method of preparing a porous structural unit according to the first invention is characterized by comprising a step of putting a material including resin particles into a space formed by first and second molds, a step of producing a temperature difference between the first and second molds, a step of pressing the material with the molds, and a step of heating at least one of the molds to
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